Finding the Fourth Proportional to 1,470.94, 2,217.55 and 1,391.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,470.94 : 2,217.55 = 1,391.56 : x
2. Step 2: Convert to fraction form
   1,470.94/2,217.55 = 1,391.56/x
3. Step 3: Cross multiply
   1,470.94x = 2,217.55 × 1,391.56
4. Step 4: Simplify right side
   1,470.94x = 3,085,853.88
5. Step 5: Solve for x
   x = 3,085,853.88/1,470.94
6. Step 6: Final answer
   x = 2,097.88